Restrict pan trap species data entry to role = 'Expert entomologist'

[DavidRoy]

We've agreed a change of approach for data entry of pan trap species data

Restrict data entry pages for user with role = 'Expert entomologist'

• [x] https://pollinator-monitoring.net/select-pan-trap-samples-add-insect-species-data
• [x] https://pollinator-monitoring.net/select-pan-trap-samples-add-insect-bycatch-data

[andrewvanbreda]

@DavidRoy Done. Note that no one currently has that role yet apart from my test user.